/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "mapinc.h"

static int is48;

static DECLFW(Mapper33_write) {
	//printf("%04x:%02x, %d\n",A,V,scanline);

	A &= 0xF003;
	if (A >= 0xA000 && A <= 0xA003)
		VROM_BANK1(0x1000 + ((A & 3) << 10), V);
	else switch (A) {
		case 0x8000: if (!is48) MIRROR_SET((V >> 6) & 1);
			ROM_BANK8(0x8000, V);
			break;
		case 0x8001: ROM_BANK8(0xA000, V); break;
		case 0x8002: VROM_BANK2(0x0000, V); break;
		case 0x8003: VROM_BANK2(0x0800, V); break;
		}
}

static DECLFW(Mapper48_HiWrite) {
	switch (A & 0xF003) {
	case 0xc000: IRQLatch = V; break;
	case 0xc001: IRQCount = IRQLatch; break;
	case 0xc003: IRQa = 0; X6502_IRQEnd(FCEU_IQEXT); break;
	case 0xc002: IRQa = 1; break;
	case 0xe000: MIRROR_SET((V >> 6) & 1); break;
	}
}

static void heho(void) {
	if (IRQa) {
		IRQCount++;
		if (IRQCount == 0x100) {
			X6502_IRQBegin(FCEU_IQEXT);
			IRQa = 0;
		}
	}
}

void Mapper33_init(void) {
	SetWriteHandler(0x8000, 0xffff, Mapper33_write);
	is48 = 0;
}

void Mapper48_init(void) {
	SetWriteHandler(0x8000, 0xbfff, Mapper33_write);
	SetWriteHandler(0xc000, 0xffff, Mapper48_HiWrite);
	GameHBIRQHook = heho;
	is48 = 1;
}
